<template>
    <el-container class="home-container">
        <!-- 头部 -->
        <el-header>
            <div>
                <img src="../assets/logo1.jpg" alt="">
                <span>后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主题 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px':'200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <el-menu  background-color="#333744" text-color="#fff" active-text-color="#409eff" unique-opened :collapse="isCollapse" 
                :collapse-transition="false" :router="true" :default-active="activePath">
                    
                        <!-- 一级菜单 -->
                    <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单模板区 -->
                        <template slot="title">
                                <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                                <!-- 二级菜单 -->
                            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)"> 
                                <template slot="title">
                                    <!-- 图标 -->
                                    <i class="el-icon-menu"></i>
                                    <!-- 文本 -->
                                    <span>{{subItem.authName}}</span>
                                </template>
                            </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            
            <!-- 右侧内容主体 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
            
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return{
            // 左侧菜单数据
            menuList:[],
            // 图标对象
            iconsObj:{
                '125':'el-icon-s-custom',
                '103':'el-icon-s-cooperation',
                '101':'el-icon-s-goods',
                '102':'el-icon-s-order',
                '145':'el-icon-s-marketing'
            },
            // 是否折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:''
        }
    },
    // 生命周期函数
    created(){
        this.getMenuList();
        this.activePath=window.sessionStorage.getItem('activePath');
    },
    methods:{
        logout(){
            
           window.sessionStorage.clear();
        //    路由重定向
            this.$router.push('/login')
        },
        // 获取所有的菜单
       async getMenuList(){
          const {data:res} = await this.$http.get('menus');
          if(res.meta.status!==200) return this.$message.error('res.meta.msg');
          this.menuList=res.data;
        },
        // 点击按钮折叠与展开
        toggleCollapse(){
            this.isCollapse=! this.isCollapse;
        },
        // 保存链接的激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath);
            this. activePath= activePath;
        }
    }
}
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
    
}
.el-header{
    background-color: #373D41;
    display: flex;
    justify-content:space-between;
    // padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    // 嵌套
    >div{
        display: flex;
        // 纵向对齐
        align-items: center;
    }
    span{
        margin-left: 15px;
    }
    img{
        width: 40px;
        height: 40px;
        border-radius: 50%;
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
}
.el-main{
    background-color: #eaedf1;
}
.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color:#fff;
    text-align: center;
    // 字间距
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
